<!DOCTYPE html>
<div style="columns:2;">
  <div style="position: relative">
    <div id="spanner" style="column-span:all;">
  </div>
</div>
<script>
if (window.testRunner)
  testRunner.dumpAsText();

document.documentElement.offsetTop;
document.getElementById('spanner').style.display = 'none';
</script>
Passes if no crash.
